Sow-block holder for hammers



March 18, 1930. M. H. DAMERELL 1,751,075'

SOW BLOCK HOLDER FOR HAMMERS Fi1ed May 11; 192s 2 sheets-sheet 1 ..M2.ll'l1 18, 1930 l M. H. DAMERELL. 1,751,075

SOW BLOCK HOLDER FOR HAMMERS Filed May l1, 1928 2 Sheets-Sheet 2 l 62 t Qdmsm Patented Mar. 18, 1930 erica MARK H. DAMERELL, OF WORCESTER, MASSACHUSETTS SOW-VBLOCK HOLDER FOR HAMMERS Application mea May 11,

This invention relates to sow block holders for hammers.' y,

In forging hammers, it is the usual practice to heat the dies carried by the sow blocks,

which necessarily imparts heat to the sow blocks. This causes expansion of the sow block while the base to which the sow block is rigidly attached, is not permitted to expand as it is not heated. Consequently, enormous strains are produced and it frequently happens that the bases of the large forging hammers are cracked through from the top to the bottom, thus rendering the entire base unserviceable for any further use.

When it is considered that these bases are of expensive and ponderous construction, and require elaborate supporting foundations, it is apparent that the expense resulting from a cracked base is enormous.

Further than this, in view of the fact that the sow block is relatively small as compared with the base, it is apparent that it heats and cools very quickly, long before any temperal ture change could possibly affect the base. Thus, there is great danger of cracking, noted above, and also of loosening of the sow block.

Further than this, in certain forms of hammers it is also the practice to carry the die Y directly upon the base and to secure the die to the base. Under these conditions, the same defects appear due to expansion of the die with consequent danger of cracking the base. This invention is designed to overcome the defects noted above, and objects of such inven-tion are to provide a novel means of holding the s-ow block or equivalent member, so that there is no danger of cracking the base, although the sow block may Yexpand when heated.

Further objects are tol provide a novel means of holding the sow .block which will not loosen when the sow block cools, but which will take up the expansion or contraction while maintaining a rigid and secure '45 connection between the sow block and the base.

Further objects are to provide a novel construction having the characteristics enumer- V ated above, which is 'easyvv to assemble and which cannot be dislodged.

V'construction illustrated vinY Figure l 1928. Serial No. 276,967.

An embodiment of the invention is shown 1n the accompanying drawings in which:

Figure l is a side elevation of the bottom portion of a forging hammer; i

Figure 2 is a fragmentary plan view of the structure shown in Figure 1.

In the drawings, one form of sow block has i been shown, but it is, ofcourse, to be understood that any form ofsow block is intended, c

this base, a pair ofstandards 2 rise to the cylinder ofthe hammer. The. base is mounted in any suitable manner, as shown for, example in Figure 1.

The upper portion of the base is provided with a transverse cut-out or grooved part which receives the sow block 8. This sow block is provided with an outwardly bulged portion 4 which slants towards opposite sides and whichalso slants outwardly towards the bottom of the sow block. It fits in a yc'orrespondingly shaped Adovetailed or slanting portion of the main slot for the reception of the sow block. This construction lateral'shifting of the sow block. i

The die 5 is keyed by means ofthe dovetail to the sow block in the usualmanner. i l The other facefoftheV sow; block is smooth and is tapered as indicated by the reference character 6 in Figure 1. It fits within the overhanging or dovetailed side of the groove formed in the base and is spaced therefrom.-

erence character 8.V

A Acorrugated steel shim 9 is positioned im- Y prevents noY This side of the groove is indicatedby-the refdoes notfill the entire groove, andthe rest of l the grooveis filled by means of a hardened straight shim 10 having an outwardly. turned n end 11 to hold it in place, and a tapered key 'corrugated shim 9.

Sis slipped into place and subsequently the e :at

tapered key 12 is driven into place. This tapered key bears against the hardened shim 10 and the hardened'shim prevents cutting of either the key or the corrugated shim.

Further than this, VWhen the tapered key is driven into place,V it slightly compresses theV corrugated shim and thus produces the requisite pressure against the side of the sow block and thus locks the sow block in place. It' is apparent that When the die is ,heated prior to the forging operation, that heatfis transmitted to the sow block. This Ycauses expansion oi' the sow 'blockand when it is vconsidered that the base 'does not expand, it

Will be immediately appreciated that the corrugated steel shim 9 takes up this expansionl and maintains the pressure substantially uniY form against thesowvblock Without allow-Y ing any dangerous increase in pressure. There is, consequently, no danger'vvhatsoever oflcrackingthe base due toexp'ansion of the sow block;

Further than this, cooling of the sovv block doesnot loosenl it as the corrugated shim 9 takes Yup any change in size of the sow block With Vreference to the base.

' Inl view of the Vfact that Ythe devices described, namely, the corrugated shir'n9, the hardened shim 10, and the key V12, are set at slightly different angles with respect to the vertical, as shown in Figurel, it is Vapparent 1.111 a hammerV having a baseY providedA with a slot having overhanging slanting side Walls, 'a sovv block having slant-ing sides, a corrugatedshimand a hardened straight shim interposed between a side of the soW block and afsidejof the slot, anda Wedge andthe adjacent side ofthe slot. Y,

2. in a hammer having a base provide-d Vivith a slot having overhangingy slanting side yralls, a sow block having slanting sides, a corrugatedA shim and a hardened straight shim `driven-between the hardened straight shim interposed vbetween a sideofrthe sow block p and a side of the slot, and a Wedge driven be` tween the hardened straight shim and the adjacent side ofthe slot,1said shims and Wedge being arranged tical.

j lIntestinfionythatI claimthe foregoingil Vat different angles'to the ver- Y have hereunto set my v,hand at Worcester, in v the county'of Worcesterfand State of Massachusetts. u l

- Y H. DAMERELL.

that noneof them can pull upwardly out of p1ace. In fact, each one is locked by a dovetail action, asis apparentfrom this figure.

Itvvill be seen,1therefore, that a-very simo ,Y

ple and secure construction has been provided by this invention which will retain the sow block in place, irrespective of expansion or contraction, and Which Vvvill not allow cracking of the base, but Which takes up any variation in vrelative size oi the sow block andbase. Y

Y It is-intended that thentermy sowr'block beV given its usual meaning and also such meaning as AWill includey any similarV device. iFor instance, the expressions anvil cap, chair, Y l

Y block,V are all used in the same sense, and'it is therefore, intended that the expression sow ther, as previously mentioned; itis sometimes the',V practice to key the Vdie proper directly to the base Withoutthe useofan intermediate V/sovv block'proper. Therefore, to avoid needL less'repetitions oi'f claims 'and expressions thereinpit isgintended f that the expression 

